Trends of Ozone and O_x in Switzerland from 1992 to 2007: Observations at Selected Stations of the NABEL, OASI (Ticino) and ANU (Graubunden) Networks Corrected for Meteorological Variability

摘要

Long-term changes of ozone concentrations are influenced by a variety ofquantities, in particular meteorological variables and emissions. In order toevaluate the contributions of regional emissions and of the backgroundconcentration to changes in observed ozone levels, the variability due tometeorology has to be removed. Ordonez et al. (2005) investigated thetemporal evolution of tropospheric ozone over the Swiss Plateau usingmeteorological and air quality measurements taken at stations of the Swiss airquality networks NABEL and OSTLUFT. Time period was 1992 to 2002including a discussion of the heat wave in summer 2003. The air qualitymeasurements were corrected for meteorological influences on the basis of amulti-linear model approach. Despite the emission abatement measures ofthe last decades no significant decrease in ozone levels was observed. Airquality stations south of the Alps, which often act as a barrier for air massexchange between south and north, were not included in the investigation.